I was disappointed at first, but then I scrolled through the comments (I know, I know), and found a whole little community of people who found it similarly thrilling. And I dunno, I guess it's nice that we can have entire little communities of people devoted to little things like elevator design and mechanics! To them, a video (and elevator) like this truly IS Epic, as stated in the video!
Typical is the someone wheels a large object like a trash bin or stacked boxes and then the edge catches on a landing and crushes an occupant against the top rear corner.
Why 2 or 4? The whole idea of a paternoster is that there always is a car at every floor (see the animation and videos at https://en.wikipedia.org/wiki/Paternoster_lift)
If there wasn’t, they would be really dangerous, as you could step into the elevator shaft while the nearest car was ten floors down.
https://youtu.be/hI0klJJNLHA gives a view.
That's how I discovered this community. It's always amusing to find out new niches some group of people care about, you can find the most amazing (and unexpected) things.